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Message-Id: <20250911162641.796716-1-kaushlendra.kumar@intel.com> Date: Thu, 11 Sep 2025 21:56:41 +0530 From: Kaushlendra Kumar <kaushlendra.kumar@...el.com> To: dave@...olabs.net, paulmck@...nel.org, josh@...htriplett.org, frederic@...nel.org, neeraj.upadhyay@...nel.org, rostedt@...dmis.org Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org, Kaushlendra Kumar <kaushlendra.kumar@...el.com> Subject: [PATCH v2] rcu/segcblist: Use WRITE_ONCE() for rclp->len decrement Use WRITE_ONCE() for rclp->len decrement in rcu_cblist_dequeue() to maintain consistency with rcu_cblist_enqueue(), which already uses WRITE_ONCE() for rclp->len increment. It maintains consistent access patterns to the rclp->len field across both enqueue and dequeue operations. Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@...el.com> --- Changes in v2: - Revised justification to focus on code consistency rather than concurrent access claims. - Revised commit message to use imperative mood throughout per kernel documentation guidelines (suggested by Markus Elfring). kernel/rcu/rcu_segcblist.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c index 1693ea22ef1b..e10b36e9de54 100644 --- a/kernel/rcu/rcu_segcblist.c +++ b/kernel/rcu/rcu_segcblist.c @@ -71,7 +71,7 @@ struct rcu_head *rcu_cblist_dequeue(struct rcu_cblist *rclp) rhp = rclp->head; if (!rhp) return NULL; - rclp->len--; + WRITE_ONCE(rclp->len, rclp->len - 1); rclp->head = rhp->next; if (!rclp->head) rclp->tail = &rclp->head; -- 2.34.1
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